> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-apis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-apis/accessing-os-apis/os-vector-tile-api/getting-started/cadcorp-sis.md).

# Cadcorp SIS

The Cadcorp Spatial Information System® (Cadcorp SIS®) is an integrated family of geospatial products comprising desktop, web, and developer applications.

Cadcorp SIS Desktop connects directly to the Ordnance Survey Data Hub through dedicated wizards.

## What you need

* OS Vector Tile API added to an API project in the OS Data Hub with an API Key; see [Getting started with an API project](/os-apis/core-concepts/getting-started-with-an-api-project.md) for more information
* Cadcorp SIS (version SIS 9 or later)

## Instructions

{% stepper %}
{% step %}

#### Add overlay

Once a new map has been set up, in the Home tab, click *Add Overlay*.

<figure><img src="/files/UXlHq0EhwVyP19jZ7LWY" alt="Cadcorp SIS Desktop UI highlighting Add Overlay button."><figcaption><p>Cadcorp SIS Desktop UI with the Add Overlay button highlighted.</p></figcaption></figure>
{% endstep %}

{% step %}

#### Select API

In the Overlay Types dialog:

* Select *Ordnance Survey (GB) > OS (GB) Data Hub*, and then click *Next*.

In the OS (GB) Data Hub dialog:

* Select \_OS Vector Tile API.
* **API Key**: Enter your API Key.
* **Premium/Public Sector Plan**: Select this option if you have this plan.
* **Save in the UI settings database (encrypted)**: Select this option.
* Click *Next*.

<figure><img src="/files/8O6YJsFUVgq3m7iD0T76" alt="Cadcorp SIS Desktop OS (GB) Data Hub dialog"><figcaption><p>Cadcorp SIS Desktop OS (GB) Data Hub dialog.</p></figcaption></figure>
{% endstep %}

{% step %}

#### Adding layers to the map

In the OS (GB) Data Hub Vector Tile API dialog, select the appropriate layer from the list of available options, and then click *Finish*.

<figure><img src="/files/mnSxfKeqI7RmcxMRx48R" alt="Cadcorp SIS Desktop OS (GB) Data Hub Vector Tile API dialog"><figcaption><p>Cadcorp SIS Desktop OS (GB) Data Hub Vector Tile API dialog.</p></figcaption></figure>

*The selected layer will then display in the* SIS Workspace Definition (SWD) \_and the data will display in the map area:

<figure><img src="/files/6mqlSD6tk7SUxuskZETI" alt="Cadcorp SIS Desktop showing loaded OS Vector Tiles in SWD and map area"><figcaption><p>Cadcorp SIS Desktop UI showing OS Vector Tile API in the map area.</p></figcaption></figure>
{% endstep %}
{% endstepper %}


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